Here we have another EVO TV video that's a fine recipe for car-guy action: the 3,990-pound Aston Martin DBS Volante and its 510-horsepower 6.0-liter V12, the 3,661-pound Mercedes-Benz SLS AMG Roadster and its 571-horse 6.2-liter V8, one English track, Tiff Needell, and one million drops of rain. Mix, record, and voila.